Action Comics #399
Superman is brought to the 24th century with other heroes from the past as part of a future history lesson, but he learns that he may really be the second duplicate Superman created after the first one from Krypton, died. When he returns to his own time he deduces that he apparently traveled to the future Earth of another dimension.
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Superman is brought to the 24th century with other heroes from the past as part of a future history lesson, but he learns that he may really be the second duplicate Superman created after the first one from Krypton, died. When he returns to his own time he deduces that he apparently traveled to the future Earth of another dimension.
Plot details indexed by the Grand Comics Database (CC BY-SA).